North American Network Operators Group

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Re: ISPs Blocking Private Addresses?

  • From: Joe Shaw
  • Date: Mon Feb 09 16:06:58 1998

Most people use what's commonly refered to as Martian filters to filter
out private address spacing.  It allows those ISPs to use private address
space internally and not have to worry about advertising them via external
routing protocols and also keeps them from accepting bogus route
announcements from other providers who haven't used the filters.

On Sun, 8 Feb 1998, Peter Ford wrote:

> Do most ISPs explicitly block private IP addresses (e.g. 10.X.X.X) at their
> borders?
> Do the "default-less" ISPs filter private addresses or do they let
> routing/forwarding do the work?


> thanks, peter

Joe Shaw - [email protected]
NetAdmin - Insync Internet Services